Signal generating circuit for detecting ground status

ABSTRACT

A signal generating circuit for detecting ground status includes a power supply input unit (A), a step down rectified power supply or DC power supply unit (C) in series. The DC power supply required by a signal detection and process unit (D) is obtained by the power supply input unit (A) passing through the step down DC power supply unit (C), and then a ground status signal is obtained and outputted via a resistor unit (B) and the signal detection and process unit (D) connected in turn.

BACKGROUND OF THE PRESENT INVENTION

1. Field of Invention

The present invention relates to a signal generating circuit, and more particularly to a signal generating circuit for detecting ground status.

2. Description of Related Arts

Signal generating circuit is a common circuit and widely applied to electrical or electronic industry, wherein the signal generating circuit comprises a signal outputting circuit, and a step down rectifier circuit or DC power supply unit. When the power cable or the electrical equipment is not grounded or grounded in an improper way, there are significant safety risks to the human bodies and the equipments.

SUMMARY OF THE PRESENT INVENTION

An object of the present invention is to overcome the above drawbacks of the conventional technology, wherein the signal generating circuit for detecting ground status provides a security inspection for detecting its grounding status or detecting the grounding status of the power input cable or the electrical equipment.

Accordingly, in order to accomplish the above object, the present invention provides a signal generating circuit for detecting ground status.

The signal generating circuit comprises a power supply input unit A and a step down DC power supply unit C connected to the power supply input unit A. A power source is inputted into the power supply input unit A to pass through the step down DC power supply unit C to obtain a DC power source, which is for the need of a signal detection and process unit D, and then connecting to a resistor unit B and the signal detection and process unit D respectively to obtain and output a ground status signal.

The above object of the signal generating circuit for detecting ground status can further be achieved with the followings.

The resistor unit B comprises one or more resistors connected with each other in parallel or in series.

The resistor unit B comprises a resistor R_(A), a resistor R_(B), a resistor R_(C), and a resistor R_(D), wherein the resistor R_(A) is connected to R_(B) in series, wherein an input end of the resistors R_(A), R_(B) in series is connected to a hot wire (live wire) of the power supply input unit A, and an output end of the resistors R_(A), R_(B) in series is connected to an earth wire (ground wire) of the signal detection and process unit D. The resistors R_(C), R_(D) are connected in series, wherein an input end of the resistors R_(C), R_(D) in series is connected to a neutral wire (null line) of the power supply input unit A, and an output end of the resistors R_(C), R_(D) in series is connected to the ground wire of the signal detection and process unit D.

The resistor unit B comprises a resistor R_(A), a resistor R_(B), wherein the resistor R_(A) is connected to R_(B) in series, wherein an input end of the resistors R_(A), R_(B) in series is connected to a hot wire of the power supply input unit A, and an output end of the resistors R_(A), R_(B) in series is connected to a ground wire of the signal detection and process unit D.

The resistor unit B comprises a resistor R_(A), a resistor R_(B), a resistor R_(C), and a resistor R_(D), wherein the resistor R_(A) is connected to R_(B) in series, wherein an input end of the resistors R_(A), R_(B) in series is connected to a hot wire of the power supply input unit A, and an output end of the resistors R_(A), R_(B) in series is connected to an Vcc of the signal detection and process unit D. The resistors R_(C), R_(D) are connected in series, wherein an input end of the resistors R_(C), R_(D) in series is connected to the neutral wire of the power supply input unit A, and an output end of the resistors R_(C), R_(D) in series is connected to the Vcc of the signal detection and process unit D.

The resistor unit B comprises a resistor R_(A), a resistor R_(B), a resistor R_(C), and a resistor R_(D), wherein the resistor R_(A) is connected to R_(B) in series, wherein an input end of the resistors R_(A), R_(B) in series is connected to a hot wire of the power supply input unit A, and an output end of the resistors R_(A), R_(B) in series is connected to an Vcc of the signal detection and process unit D.

The signal detection and process unit D comprises a resistor R₁, a resistor R₂, a resistor R₃, a resistor R₄, a diode D₅, a diode D₁₅, a chip U₁, wherein a positive pole of the diode D₁₅ is connected to a ground wire of the chip U₁, and a negative pole of the diode D₁₅ is connected to a negative terminal (−) of the chip U₁. A voltage divider of the connected in series resistors R₁, R₂ is parallel connected to a voltage divider of the connected in series resistors R₃, R₄ and the diode D₅. A voltage divider connecting point 2 between the resistors R₁ and R₂ is connected to a position terminal (+) of the chip U₁, wherein the other end of the resistor R₁ is connected to a Vcc of the chip U₁, wherein the other end of the resistor R₂ is connected to a ground wire of the chip U₁. A voltage divider connecting point 3 of the resistors R₃, R₄, and the diode D₅ is connected to the negative terminal of the chip U₁, wherein one end of the resistor R₄ is connected to the Vcc of the chip U₁, and the other end of the resistor R₄ is connected to a positive pole of the diode D₅, wherein a negative pole of the diode D₅ is connected to the voltage divider connecting point 3. One end of the resistor R₃ is connected to the ground wire of the chip U₁, and the other end of the resistor R₃ is connected to the voltage divider connecting point 3. An output end of the resistor unit B is connected to the negative terminal of the chip U₁. A ground wire SGND of the power supply input unit A is connected to the negative terminal of the chip U₁, and an output signal is connected to an output end of the chip U₁.

The signal detection and process unit D comprises a resistor R₁, a resistor R₂, a resistor R₃, a resistor R₄, a diodes D₅, a voltage regulator diode (Zener diode) ZD₁, and a chip U₁, wherein a negative pole of the voltage regulator diode ZD₁ is connected to a Vcc of the chip U₁, and a positive pole of the voltage regulator diode ZD₁ is connected to a positive terminal of the chip U₁. A voltage divider of the connected in series resistors R₁, R₂ is parallel connected to a voltage divider of the connected in series resistors R₃, R₄ and the diode D₅. A voltage divider connecting point 2 between the resistors R₁ and R₂ is connected to a negative terminal of the chip U₁, wherein the other end of the resistor R₁ is connected to a Vcc of the chip U₁, wherein the other end of the resistor R₁ is connected to a ground wire of the chip U₁. A voltage divider connecting point 3 of the resistors R₃, R₄, and the diode D₅ is connected to the positive terminal of the chip U₁, wherein one end of the resistor R₄ is connected to the Vcc of the chip U₁, and the other end of the resistor R₄ is connected to a positive pole of the diode D₅, wherein a negative pole of the diode D₅ is connected to the voltage divider connecting point 3. One end of the resistor R₃ is connected to the ground wire of the chip U₁, and the other end of the resistor R₃ is connected to the voltage divider connecting point 3. An output end of the resistor unit B is connected to the Vcc of the chip U₁. A ground wire SGND of the power supply input unit A is connected to the positive terminal of the chip U₁, and an output signal is connected to an output end of the chip U₁.

The signal detection and process unit D comprises a resistor R₁, a resistor R₂, a resistor R₃, a diodes D₁, a diodes D₂, and a chip U₁, wherein one end of the resistor R₁ is connected to a ground wire SGND of the power supply input unit A, and the other end of the resistor R₁ is connected to one of the I/O pins of the chip U₁ through the connecting point 1 and 2 respectively. A voltage divider of the connected in series resistors R₂, R₃ is parallely connected to the connected in series diode D₁ and D₂, wherein the other end of the resistor R₂ and an positive pole of the diode D₂ are connected to a ground wire GND pin 4 of the chip U₁, and the other end of the resistor R₃ and a negative pole of the diode D₁ are connected to a power Vcc pin 8 of the chip U₁. An output end of the resistor unit B is connected to the ground wire GND pin 4 of the chip U₁.

The present invention has the following advantages in comparison with the conventional technology.

Applying the above signal generating circuit is simple in structure and practical. The signal generating circuit can effectively detect the importation of power cables or electrical equipment grounding status, so as to ensure the safety of human bodies and the operation of the equipments.

These and other objectives, features, and advantages of the present invention will become apparent from the following detailed description, the accompanying drawings, and the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram of the signal generating circuit for detecting the ground status according to the present invention.

FIG. 2 is a schematic signal generating circuit for detecting the ground status according to a first preferred embodiment of the present invention.

FIG. 3 is a schematic signal generating circuit for detecting the ground status according to a second preferred embodiment of the present invention.

FIG. 4 is a schematic signal generating circuit for detecting the ground status according to a third preferred embodiment of the present invention.

FIG. 5 is a schematic signal generating circuit for detecting the ground status according to a fourth preferred embodiment of the present invention.

FIG. 6 is a schematic signal generating circuit for detecting the ground status according to a fifth preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

It will combine the accompany drawings to further describe the present invention as follows.

Referring to FIGS. 1 and 2 of the drawings, a first preferred embodiment of the present invention is illustrated.

Referring to the accompany drawings, the signal generating circuit for detecting ground status comprises a power supply input unit A and a step down DC power supply unit C, wherein the power supply input unit A is connected to the step down DC power supply unit C, wherein a power source is inputted into the power supply input unit A to pass through the step down DC power supply unit C to obtain a DC power source, which is for the need of a signal detection and process unit D, and then connecting to a resistor unit B and the signal detection and process unit D respectively to obtain and output a ground status signal.

The resistor unit B comprises a resistor R_(A), a resistor R_(B), a resistor R_(C), and a resistor R_(D), wherein the resistor R_(A) is connected to the resistor R_(B) in series, wherein an input end of the resistors R_(A), R_(B) in series is connected to a hot wire of the power supply input unit A, and an output end of the resistors R_(A), R_(B) in series is connected to a ground wire of the signal detection and process unit D. The resistors R_(C), R_(B) are connected in series, wherein an input end of the resistors R_(C), R_(D) in series is connected to the neutral wire of the power supply input unit A, and an output end of the resistors R_(C), R_(D) in series is connected to the ground wire of the signal detection and process unit D.

The signal detection and process unit D comprises a resistor R₁, a resistor R₂, a resistor R₃, a resistor R₄, a diode D₅, a diode D₁₅, and a chip U₁, wherein a positive pole of the diode D₁₅ is connected to a ground wire of the chip U₁, and a negative pole of the diode D₁₅ is connected to a negative terminal of the chip U₁. A voltage divider of the connected in series resistors R₁, R₂ is parallel connected to a voltage divider of the connected in series resistors R₃, R₄ and the diode Ds. A voltage divider connecting point 2 between the resistors R₁ and R₂ is connected to a positive terminal of the chip U₁, wherein the other end of the resistor R₁ is connected to a Vcc of the chip U₁, wherein the other end of the resistor R₂ is connected to a ground wire of the chip U₁. A voltage divider connecting point 3 of the resistors R₃, R₄, and the diode D₅, which is located in between the resistor R₃ and the resistor R₄, diode D₅, is connected to the negative terminal of the chip U₁, wherein one end of the resistor R₄ is connected to the Vcc of the chip U₁, and the other end of the resistor R₄ is connected to a positive pole of the diode D₅, wherein a negative pole of the diode D₅ is connected to the voltage divider connecting point 3. One end of the resistor R₃ is connected to the ground wire of the chip U₁, and the other end of the resistor R₃ is connected to the voltage divider connecting point 3. An output end of the resistor unit B is connected to the negative terminal of the chip U₁. A ground wire SGND of the power supply input unit A is connected to the negative terminal of the chip U₁, and an output signal is connected to an output end of the chip U₁.

Referring to FIGS. 1 and 3 of the drawings, a second preferred embodiment of the present invention is illustrated.

Referring to the accompany drawings, the signal generating circuit for detecting ground status comprises a power supply input unit A and a step down DC power supply unit C, wherein the power supply input unit A is connected to the step down DC power supply unit C, wherein a power source is inputted into the power supply input unit A to pass through the step down DC power supply unit C to obtain a DC power source, which is for the need of a signal detection and process unit D, and then connecting to a resistor unit B and the signal detection and process unit D respectively to obtain and output a ground status signal.

The resistor unit B comprises a resistor R_(A), wherein an input end of the resistor unit B is connected to a hot wire of the power supply input unit A, and an output end of the resistor unit B is connected to a Vcc of the signal detection and process unit D.

The signal detection and process unit D comprises a resistor R₁, a resistor R₂, a resistor R₃, a resistor R₄, a diodes D₅, a voltage regulator diode ZD₁, and a chip U₁, wherein a negative pole of the voltage regulator diode ZD₁ is connected to a Vcc of the chip U₁, and a positive pole of the voltage regulator diode ZD₁ is connected to a positive terminal of the chip U₁. A voltage divider of the connected in series resistors R₁, R₂ is parallel connected to a voltage divider of the connected in series resistors R₃, R₄ and the diode D₅. A voltage divider connecting point 2 between the resistors R₁ and R₂ is connected to a negative terminal of the chip U₁, wherein the other end of the resistor R₁ is connected to the Vcc of the chip U₁, wherein the other end of the resistor R₂ is connected to a ground wire of the chip U₁. A voltage divider connecting point 3 of the resistors R₃, R₄, and the diode D₅ is connected to a positive terminal of the chip U₁, wherein one end of the resistor R₄ is connected to the Vcc of the chip U₁, and the other end of the resistor R₄ is connected to a positive pole of the diode D₅, wherein a negative pole of the diode D₅ is connected to the voltage divider connecting point 3. One end of the resistor R₃ is connected to the ground wire of the chip U₁, and the other end of the resistor R₃ is connected to the voltage divider connecting point 3. An output end of the resistor unit B is connected to the Vcc of the chip U₁. A ground wire SGND of the power supply input unit A is connected to the positive terminal of the chip U₁, and an output signal is connected to an output end of the chip U₁.

Referring to FIGS. 1 and 4 of the drawings, a third preferred embodiment of the present is illustrated.

Referring to the accompany drawings, the signal generating circuit for detecting ground status comprises a power supply input unit A and a step down DC power supply unit C, wherein the power supply input unit A is connected to the step down DC power supply unit C, wherein a power source is inputted into the power supply input unit A to pass through the step down DC power supply unit C to obtain a DC power source, which is for the need of a signal detection and process unit D, and then connecting to a resistor unit B and the signal detection and process unit D respectively to obtain and output a ground status signal.

The resistor unit B comprises a resistor R_(A) and a resistor R_(B), wherein the resistors R_(A), R_(B) are connected in series, wherein an input end of the resistor unit B is connected to a hot wire of the power supply input unit A, and an output end of the resistor unit B is connected to a ground wire of the signal detection and process unit D.

The signal detection and process unit D comprises a resistor R₁, a resistor R₂, a resistor R₃, a diodes D₁, a diodes D₂, and a chip U₁, wherein one end of the resistor R₁ is connected to a ground wire SGND of the power supply input unit A, and the other end of the resistor R₁ is connected to one of the I/O pins of the chip U₁ through the voltage divider connecting point 1 and 2 respectively. A voltage divider of the connected in series resistors R₂, R₃ is parallely connected to the connected in series of the diode D₁ and the D₂, wherein the other end of the resistor R₂ and an positive pole of the diode D₂ are connected to a ground wire GND pin 4 of the chip U₁, and the other end of the resistor R₃ and a negative pole of the diode D₁ are connected to a power Vcc pin 8 of the chip U₁. An output end of the resistor unit B is connected to the ground wire GND pin 4 of the chip U₁.

Referring to FIGS. 1 and 5 of the drawings, a fifth preferred embodiment of the present invention is illustrated.

Referring to the accompany drawings, the signal generating circuit for detecting ground status comprises a power supply input unit A and a step down DC power supply unit C, wherein the power supply input unit A is connected to the step down DC power supply unit C, wherein a power source is inputted into the power supply input unit A to pass through the step down DC power supply unit C to obtain a DC power source, which is for the need of a signal detection and process unit D, and then connecting to a resistor unit B and the signal detection and process unit D respectively to obtain and output a ground status signal.

The resistor unit B comprises a resistor R_(A), a resistor R_(B), a resistor R_(C), and a resistor R_(D), wherein the resistor R_(A) is connected to R_(B) in series, wherein an input end of the resistors R_(A), R_(B) connected in series is connected to a hot wire of the power supply input unit A, and an output end of the resistors R_(A), R_(B) connected in series is connected to an Vcc of the signal detection and process unit D. The resistors R_(C), R_(D) are connected in series, wherein an input end of the resistors R_(C), R_(D) in series is connected to the neutral wire of the power supply input unit A, and an output end of the resistors R_(C), R_(D) in series is connected to the Vcc of the signal detection and process unit D.

The signal detection and process unit D comprises a resistor R₁, a resistor R₂, a resistor R₃, a resistor R₄, a diodes D₅, a voltage regulator diode ZD₁, and a chip U₁, wherein a negative pole of the voltage regulator diode ZD₁ is connected to a Vcc of the chip U₁, and a positive pole of the voltage regulator diode ZD₁ is connected to a negative terminal of the chip U₁. A voltage divider of the connected in series resistors R₁, R₂ is parallel connected to a voltage divider of the connected in series resistors R₃, R₄ and the diode D₅. A voltage divider connecting point 2 between the resistors R₁ and R₂ is connected to a positive terminal of the chip U₁, wherein the other end of the resistor R₁ is connected to a Vcc of the chip U₁, wherein the other end of the resistor R₂ is connected to a ground wire of the chip U₁. A voltage divider connecting point 3 of the resistors R₃, R₄, and the diode D₅ is connected to the negative terminal of the chip U₁, wherein one end of the resistor R₄ is connected to the Vcc of the chip U₁, and the other end of the resistor R₄ is connected to a positive pole of the diode D₅, wherein a negative pole of the diode D₅ is connected to the voltage divider connecting point 3. One end of the resistor R₃ is connected to the ground wire of the chip U₁, and the other end of the resistor R₃ is connected to the voltage divider connecting point 3. An output end of the resistor unit B is connected to the Vcc of the chip U₁. A ground wire SGND of the power supply input unit A is connected to the negative terminal of the chip U₁, and an output signal is connected to an output end of the chip U₁.

Referring to FIGS. 1 and 6 of the drawings, a fifth preferred embodiment of the present invention is illustrated.

Referring to the accompany drawings, the signal generating circuit for detecting ground status comprises a power supply input unit A and a step down DC power supply unit C, wherein the power supply input unit A is connected to the step down DC power supply unit C, wherein a power source is inputted into the power supply input unit A to pass through the step down DC power supply unit C to obtain a DC power source, which is for the need of a signal detection and process unit D, and then connecting to a resistor unit B and the signal detection and process unit D respectively to obtain and output a ground status signal.

The resistor unit B comprises a resistor R_(A) and a resistor R_(B), wherein the resistors R_(A), R_(B) are connected in series, wherein an input end of the resistor unit B is connected to a hot wire of the power supply input unit A, and an output end of the resistor unit B is connected to a Vcc of the signal detection and process unit D.

The signal detection and process unit D comprises a resistor R₁, a resistor R₂, a resistor R₃, a voltage regulator diode ZD₁, and a chip U₁, wherein one end of the resistor R₁ is connected to a ground wire SGND of the power supply input unit A, and the other end of the resistor R₁ is connected to a I/O pin 1 of the chip U₁ through the connecting point 1 and 2 respectively. The voltage regulator diode ZD₁ is parallely connected to the resistor R₃, wherein a negative pole of the voltage regulator diode ZD₁ is connected to a power Vcc pin 8 of the chip U₁, and a positive pole of the voltage regulator diode ZD₁ is connected to a I/O pin 1 of the chip U₁. The resistor R₂ and the resistor R₃ are connected in series to form a voltage divider, wherein one end of the resistor R₂ is connected the voltage divider connecting point 1, and the other end of the R₂ is connected to a ground wire GND pin 4, and connected to the I/O pin 1 of the chip U₁.

One skilled in the art will understand that the embodiment of the present invention as shown in the drawings and described above is exemplary only and not intended to be limiting.

It will thus be seen that the objects of the present invention have been fully and effectively accomplished. The embodiments have been shown and described for the purposes of illustrating the functional and structural principles of the present invention and is subject to change without departure from such principles. Therefore, this invention includes all modifications encompassed within the spirit and scope of the following claims. 

1-9. (canceled)
 10. A signal generating circuit for detecting ground status, comprising: a power supply unit A for being inputted a power source, wherein said power supply unit A comprises a neutral wire, a hot wire, and a ground wire; a resistor unit B provided to obtain a reference potential, wherein an input end of said resistor unit B is electrically connected to at least one of said neutral wire, and hot wire of said power supply unit A; a signal detection and process unit D, which comprises a signal detection circuit and a signal process circuit; and a step down DC power supply unit C connected to said power supply unit A, wherein said power source is inputted into said power supply unit A to pass through said step down DC power supply unit C to obtain a DC power source for said signal detection and process unit D, wherein said power supply unit C is further electrically connected to said resistor unit B and said signal detection and process unit D, so that said signal detection circuit of said signal detection and process unit D generates a ground status signal related to said reference potential of said resistor unit B, and said signal process circuit of said signal detection and process unit D outputs said ground status signal to show the ground status.
 11. The signal generating circuit for detecting ground status, as recited in claim 10, wherein said resistor unit B comprises one or more resistors, wherein said resistors are connected to each other in parallel.
 12. The signal generating circuit for detecting ground status, as recited in claim 10, wherein said resistor unit B comprises one or more resistors, wherein said resistors are connected to each other in series.
 13. The signal generating circuit for detecting ground status, as recited in claim 10, wherein said resistor unit B comprises one or more resistors, wherein said resistors are connected to each other either in parallel or in series.
 14. The signal generating circuit for detecting ground status, as recited in claim 13, wherein said resistor unit B comprises a resistor R_(A), a resistor R_(B), a resistor R_(C), and a resistor R_(D), wherein said resistor R_(A) is connected to said resistor R_(B) in series, and said resistor R_(C) is connected to said resistor R_(D) in series, wherein said resistors R_(A), R_(B) in series is parallely connected to said resistors R_(C), R_(D) in series.
 15. The signal generating circuit for detecting ground status, as recited in claim 14, wherein an input end of said resistors R_(A), R_(B) connected in series is connected to said hot wire of said power supply input unit A, wherein an input end of said resistor R_(C), R_(D) connected in series is connected to said neutral wire of said power supply input unit A.
 16. The signal generating circuit for detecting ground status, as recited in claim 15, wherein an output end of said resistors R_(A), R_(B) connected in series is connected to a ground wire of said signal detection and process unit D, wherein an output end of said resistor R_(C), R_(D) connected in series is connected to said ground wire of said signal detection and process unit D.
 17. The signal generating circuit for detecting ground status, as recited in claim 15, wherein an output end of said resistors R_(A), R_(B) connected in series is connected to a Vcc of said signal detection and process unit D, wherein an output end of said resistor R_(C), R_(D) connected in series is connected to said Vcc of said signal detection and process unit D.
 18. The signal generating circuit for detecting ground status, as recited in claim 12, wherein said resistor unit B comprises a resistor R_(A) and a resistor R_(B), wherein said resistors R_(A), R_(B) are connected in series, wherein an input end of said resistor unit B is connected to said hot wire of said power supply input unit A, and an output end of said resistor unit B is connected to one of a ground wire and a Vcc of said signal detection and process unit D.
 19. The signal generating circuit for detecting ground status, as recited in claim 10, wherein said signal detection and process unit D comprises a resistor R₁, a resistor R₂, a resistor R₃, a resistor R₄, a diode D₅, a diode D₁₅, and a chip U₁, wherein a positive pole of said diode D₁₅ is connected to a ground wire of said chip U₁, and a negative pole of said diode D₁₅ is connected to a negative terminal of said chip U₁, wherein a voltage divider of said connected in series resistors R₁, R₂ is parallel connected to a voltage divider of said connected in series resistors R₃, R₄ and said diode D₅, wherein a voltage divider connecting point 2 between said resistors R₁ and R₂ is connected to a positive terminal of said chip U₁, wherein the other end of said resistor R₁ is connected to a Vcc of said chip U₁, wherein the other end of said resistor R₂ is connected to a ground wire of said chip U₁, wherein a voltage divider connecting point 3 of said resistors R₃, R₄, and said diode D₅ is connected to said negative terminal of said chip U₁, wherein one end of said resistor R₄ is connected to said Vcc of said chip U₁, and the other end of said resistor R₄ is connected to a positive pole of said diode D₅, wherein a negative pole of said diode D₅ is connected to said voltage divider connecting point 3, wherein one end of said resistor R₃ is connected to said ground wire of said chip U₁, and the other end of said resistor R₃ is connected to said voltage divider connecting point 3, wherein an output end of said resistor unit B is connected to said negative terminal of said chip U₁, wherein a ground wire SGND of said power supply input unit A is connected to said negative terminal of said chip U₁, and an output signal is connected to an output end of said chip U₁.
 20. The signal generating circuit for detecting ground status, as recited in claim 16, wherein said signal detection and process unit D comprises a resistor R₁, a resistor R₂, a resistor R₃, a resistor R₄, a diode D₅, a diode D₁₅, and a chip U₁, wherein a positive pole of said diode D₁₅ is connected to a ground wire of said chip U₁, and a negative pole of said diode D₁₅ is connected to a negative terminal of said chip U₁, wherein a voltage divider of said connected in series resistors R₁, R₂ is parallel connected to a voltage divider of said connected in series resistors R₃, R₄ and said diode D₅, wherein a voltage divider connecting point 2 between said resistors R₁ and R₂ is connected to a positive terminal of said chip U₁, wherein the other end of said resistor R₁ is connected to a Vcc of said chip U₁, wherein the other end of said resistor R₂ is connected to a ground wire of said chip U₁, wherein a voltage divider connecting point 3 of said resistors R₃, R₄, and said diode D₅ is connected to said negative terminal of said chip U₁, wherein one end of said resistor R₄ is connected to said Vcc of said chip U₁, and the other end of said resistor R₄ is connected to a positive pole of said diode D₅, wherein a negative pole of said diode D₅ is connected to said voltage divider connecting point 3, wherein one end of said resistor R₃ is connected to said ground wire of said chip U₁, and the other end of said resistor R₃ is connected to said voltage divider connecting point 3, wherein an output end of said resistor unit B is connected to said negative terminal of said chip U₁, wherein a ground wire SGND of said power supply input unit A is connected to said negative terminal of said chip U₁, and an output signal is connected to an output end of said chip U₁.
 21. The signal generating circuit for detecting ground status, as recited in claim 17, wherein said signal detection and process unit D comprises a resistor R₁, a resistor R₂, a resistor R₃, a resistor R₄, a diode D₅, a diode D₁₅, and a chip U₁, wherein a positive pole of said diode D₁₅ is connected to a ground wire of said chip U₁, and a negative pole of said diode D₁₅ is connected to a negative terminal of said chip U₁, wherein a voltage divider of said connected in series resistors R₁, R₂ is parallel connected to a voltage divider of said connected in series resistors R₃, R₄ and said diode D₅, wherein a voltage divider connecting point 2 between said resistors R₁ and R₂ is connected to a positive terminal of said chip U₁, wherein the other end of said resistor R₁ is connected to a Vcc of said chip U₁, wherein the other end of said resistor R₂ is connected to a ground wire of said chip U₁, wherein a voltage divider connecting point 3 of said resistors R₃, R₄, and said diode D₅ is connected to said negative terminal of said chip U₁, wherein one end of said resistor R₄ is connected to said Vcc of said chip U₁, and the other end of said resistor R₄ is connected to a positive pole of said diode D₅, wherein a negative pole of said diode D₅ is connected to said voltage divider connecting point 3, wherein one end of said resistor R₃ is connected to said ground wire of said chip U₁, and the other end of said resistor R₃ is connected to said voltage divider connecting point 3, wherein an output end of said resistor unit B is connected to said negative terminal of said chip U₁, wherein a ground wire SGND of said power supply input unit A is connected to said negative terminal of said chip U₁, and an output signal is connected to an output end of said chip U₁.
 22. The signal generating circuit for detecting ground status, as recited in claim 18, wherein said signal detection and process unit D comprises a resistor R₁, a resistor R₂, a resistor R₃, a resistor R₄, a diode D₅, a diode D₁₅, and a chip U₁, wherein a positive pole of said diode D₁₅ is connected to a ground wire of said chip U₁, and a negative pole of said diode D₁₅ is connected to a negative terminal of said chip U₁, wherein a voltage divider of said connected in series resistors R₁, R₂ is parallel connected to a voltage divider of said connected in series resistors R₃, R₄ and said diode D₅, wherein a voltage divider connecting point 2 between said resistors R₁ and R₂ is connected to a positive terminal of said chip U₁, wherein the other end of said resistor R₁ is connected to a Vcc of said chip U₁, wherein the other end of said resistor R₂ is connected to a ground wire of said chip U₁, wherein a voltage divider connecting point 3 of said resistors R₃, R₄, and said diode D₅ is connected to said negative terminal of said chip U₁, wherein one end of said resistor R₄ is connected to said Vcc of said chip U₁, and the other end of said resistor R₄ is connected to a positive pole of said diode D₅, wherein a negative pole of said diode D₅ is connected to said voltage divider connecting point 3, wherein one end of said resistor R₃ is connected to said ground wire of said chip U₁, and the other end of said resistor R₃ is connected to said voltage divider connecting point 3, wherein an output end of said resistor unit B is connected to said negative terminal of said chip U₁, wherein a ground wire SGND of said power supply input unit A is connected to said negative terminal of said chip U₁, and an output signal is connected to an output end of said chip U₁.
 23. The signal generating circuit for detecting ground status, as recited in claim 10, wherein said signal detection and process unit D comprises a resistor R₁, a resistor R₂, a resistor R₃, a resistor R₄, a diodes D₅, a voltage regulator diode ZD₁, and a chip U₁, wherein a negative pole of said voltage regulator diode ZD₁ is connected to a Vcc of said chip U₁, and a positive pole of said voltage regulator diode ZD₁ is connected to a positive terminal of said chip U₁, wherein a voltage divider of said connected in series resistors R₁, R₂ is parallel connected to a voltage divider of said connected in series resistors R₃, R₄ and said diode D₅, wherein a voltage divider connecting point 2 between said resistors R₁ and R₂ is connected to a negative terminal of said chip U₁, wherein the other end of said resistor R₁ is connected to a Vcc of said chip U₁, wherein the other end of said resistor R₂ is connected to a ground wire of said chip U₁, wherein a voltage divider connecting point 3 of said resistors R₃, R₄, and said diode D₅ is connected to said positive terminal of said chip U₁, wherein one end of said resistor R₄ is connected to said Vcc of said chip U₁, and the other end of said resistor R₄ is connected to a positive pole of said diode D₅, wherein a negative pole of said diode D₅ is connected to said voltage divider connecting point 3, wherein one end of said resistor R₃ is connected to said ground wire of said chip U₁, and the other end of said resistor R₃ is connected to said voltage divider connecting point 3, wherein an output end of said resistor unit B is connected to said Vcc of said chip U₁, wherein a ground wire SGND of said power supply input unit A is connected to said positive terminal of said chip U₁, and an output signal is connected to an output end of said chip U₁.
 24. The signal generating circuit for detecting ground status, as recited in claim 16, wherein said signal detection and process unit D comprises a resistor R₁, a resistor R₂, a resistor R₃, a resistor R₄, a diodes D₅, a voltage regulator diode ZD₁, and a chip U₁, wherein a negative pole of said voltage regulator diode ZD₁ is connected to a Vcc of said chip U₁, and a positive pole of said voltage regulator diode ZD₁ is connected to a positive terminal of said chip U₁, wherein a voltage divider of said connected in series resistors R₁, R₂ is parallel connected to a voltage divider of said connected in series resistors R₃, R₄ and said diode D₅, wherein a voltage divider connecting point 2 between said resistors R₁ and R₂ is connected to a negative terminal of said chip U₁, wherein the other end of said resistor R₁ is connected to a Vcc of said chip U₁, wherein the other end of said resistor R₂ is connected to a ground wire of said chip U₁, wherein a voltage divider connecting point 3 of said resistors R₃, R₄, and said diode D₅ is connected to said positive terminal of said chip U₁, wherein one end of said resistor R₄ is connected to said Vcc of said chip U₁, and the other end of said resistor R₄ is connected to a positive pole of said diode D₅, wherein a negative pole of said diode D₅ is connected to said voltage divider connecting point 3, wherein one end of said resistor R₃ is connected to said ground wire of said chip U₁, and the other end of said resistor R₃ is connected to said voltage divider connecting point 3, wherein an output end of said resistor unit B is connected to said Vcc of said chip U₁, wherein a ground wire SGND of said power supply input unit A is connected to said positive terminal of said chip U₁, and an output signal is connected to an output end of said chip U₁.
 25. The signal generating circuit for detecting ground status, as recited in claim 17, wherein said signal detection and process unit D comprises a resistor R₁, a resistor R₂, a resistor R₃, a resistor R₄, a diodes D₅, a voltage regulator diode ZD₁, and a chip U₁, wherein a negative pole of said voltage regulator diode ZD₁ is connected to a Vcc of said chip U₁, and a positive pole of said voltage regulator diode ZD₁ is connected to a positive terminal of said chip U₁, wherein a voltage divider of said connected in series resistors R₁, R₂ is parallel connected to a voltage divider of said connected in series resistors R₃, R₄ and said diode D₅, wherein a voltage divider connecting point 2 between said resistors R₁ and R₂ is connected to a negative terminal of said chip U₁, wherein the other end of said resistor R₁ is connected to a Vcc of said chip U₁, wherein the other end of said resistor R₂ is connected to a ground wire of said chip U₁, wherein a voltage divider connecting point 3 of said resistors R₃, R₄, and said diode D₅ is connected to said positive terminal of said chip U₁, wherein one end of said resistor R₄ is connected to said Vcc of said chip U₁, and the other end of said resistor R₄ is connected to a positive pole of said diode D₅, wherein a negative pole of said diode D₅ is connected to said voltage divider connecting point 3, wherein one end of said resistor R₃ is connected to said ground wire of said chip U₁, and the other end of said resistor R₃ is connected to said voltage divider connecting point 3, wherein an output end of said resistor unit B is connected to said Vcc of said chip U₁, wherein a ground wire SGND of said power supply input unit A is connected to said positive terminal of said chip U₁, and an output signal is connected to an output end of said chip U₁.
 26. The signal generating circuit for detecting ground status, as recited in claim 18, wherein said signal detection and process unit D comprises a resistor R₁, a resistor R₂, a resistor R₃, a resistor R₄, a diodes D₅, a voltage regulator diode ZD₁, and a chip U₁, wherein a negative pole of said voltage regulator diode ZD₁ is connected to a Vcc of said chip U₁, and a positive pole of said voltage regulator diode ZD₁ is connected to a positive terminal of said chip U₁, wherein a voltage divider of said connected in series resistors R₁, R₂ is parallel connected to a voltage divider of said connected in series resistors R₃, R₄ and said diode D₅, wherein a voltage divider connecting point 2 between said resistors R₁ and R₂ is connected to a negative terminal of said chip U₁, wherein the other end of said resistor R₁ is connected to a Vcc of said chip U₁, wherein the other end of said resistor R₂ is connected to a ground wire of said chip U₁, wherein a voltage divider connecting point 3 of said resistors R₃, R₄, and said diode D₅ is connected to said positive terminal of said chip U₁, wherein one end of said resistor R₄ is connected to said Vcc of said chip U₁, and the other end of said resistor R₄ is connected to a positive pole of said diode D₅, wherein a negative pole of said diode D₅ is connected to said voltage divider connecting point 3, wherein one end of said resistor R₃ is connected to said ground wire of said chip U₁, and the other end of said resistor R₃ is connected to said voltage divider connecting point 3, wherein an output end of said resistor unit B is connected to said Vcc of said chip U₁, wherein a ground wire SGND of said power supply input unit A is connected to said positive terminal of said chip U₁, and an output signal is connected to an output end of said chip U₁.
 27. The signal generating circuit for detecting ground status, as recited in claim 10, wherein said signal detection and process unit D comprises a resistor R₁, a resistor R₂, a resistor R₃, a diodes D₁, a diodes D₂, and a chip U₁, wherein one end of said resistor R₁ is connected to a ground wire SGND of the power supply input unit A, and the other end of said resistor R₁ is connected to one of I/O pins of said chip U₁ through said voltage divider connecting point 1 and 2 respectively, wherein a voltage divider of said connected in series resistors R₂, R₃ is parallely connected to a connected in series of said diode D₁ and said diode D₂, wherein the other end of said resistor R₂ and an positive pole of said diode D₂ are connected to a ground wire GND pin 4 of said chip U₁, and the other end of the resistor R₃ and a negative pole of said diode D₁ are connected to a power Vcc pin 8 of said chip U₁, wherein an output end of said resistor unit B is connected to said ground wire GND pin 4 of said chip U₁.
 28. The signal generating circuit for detecting ground status, as recited in claim 16, wherein said signal detection and process unit D comprises a resistor R₁, a resistor R₂, a resistor R₃, a diodes D₁, a diodes D₂, and a chip U₁, wherein one end of said resistor R₁ is connected to a ground wire SGND of the power supply input unit A, and the other end of said resistor R₁ is connected to one of I/O pins of said chip U₁ through said voltage divider connecting point 1 and 2 respectively, wherein a voltage divider of said connected in series resistors R₂, R₃ is parallely connected to a connected in series of said diode D₁ and said diode D₂, wherein the other end of said resistor R₂ and an positive pole of said diode D₂ are connected to a ground wire GND pin 4 of said chip U₁, and the other end of the resistor R₃ and a negative pole of said diode D₁ are connected to a power Vcc pin 8 of said chip U₁, wherein an output end of said resistor unit B is connected to said ground wire GND pin 4 of said chip U₁.
 29. The signal generating circuit for detecting ground status, as recited in claim 17, wherein said signal detection and process unit D comprises a resistor R₁, a resistor R₂, a resistor R₃, a diodes D₁, a diodes D₂, and a chip U₁, wherein one end of said resistor R₁ is connected to a ground wire SGND of the power supply input unit A, and the other end of said resistor R₁ is connected to one of I/O pins of said chip U₁ through said voltage divider connecting point 1 and 2 respectively, wherein a voltage divider of said connected in series resistors R₂, R₃ is parallely connected to a connected in series of said diode D₁ and said diode D₂, wherein the other end of said resistor R₂ and an positive pole of said diode D₂ are connected to a ground wire GND pin 4 of said chip U₁, and the other end of the resistor R₃ and a negative pole of said diode D₁ are connected to a power Vcc pin 8 of said chip U₁, wherein an output end of said resistor unit B is connected to said ground wire GND pin 4 of said chip U₁.
 30. The signal generating circuit for detecting ground status, as recited in claim 18, wherein said signal detection and process unit D comprises a resistor R₁, a resistor R₂, a resistor R₃, a diodes D₁, a diodes D₂, and a chip U₁, wherein one end of said resistor R₁ is connected to a ground wire SGND of the power supply input unit A, and the other end of said resistor R₁ is connected to one of I/O pins of said chip U₁ through said voltage divider connecting point 1 and 2 respectively, wherein a voltage divider of said connected in series resistors R₂, R₃ is parallely connected to a connected in series of said diode D₁ and said diode D₂, wherein the other end of said resistor R₂ and an positive pole of said diode D₂ are connected to a ground wire GND pin 4 of said chip U₁, and the other end of the resistor R₃ and a negative pole of said diode D₁ are connected to a power Vcc pin 8 of said chip U₁, wherein an output end of said resistor unit B is connected to said ground wire GND pin 4 of said chip U₁. 